Yes on the Nav part. Many parts of my X5 squeak - door, rear view mirror, area around the nav, seats.

BMW says it's within operating parameters. Good luck.

BMW may say it's within operating parameters, but that doesn't mean you should accept it. A lot of dealers will tell you what you want to hear to make you go away.

I had an issue in my 330i once, I took the car to four different dealers. Three of them told me I was imagining an issue. The fourth fixed it.

Here's my advice:
1) Speak to the service manager and insist that you have a tech do a ride along so they can experience the problem.
2) Insist, insist, insist until you get the end result you are looking for.
3) If #3 doesn't happen, contact BMWNA and the BBB. I have also found that causing a scene on the showroom floor on a busy Saturday can be effective They don't want you putting off potential customers.